Abstract
The behavior of pools of water for lubrication under a point of contact between a glass disk and a steel ball is studied here, employing a home-built apparatus. A deformed water pool is found to form around the contact region under different rolling speeds. To investigate the effect of rolling speed on the water pool, two parameters (advancing angle and receding angle) are introduced to describe the shape of the water pool. Two distinct glass surfaces, namely a smooth surface and a microgrooved surface, are observed. In the case of the smooth surface, the advancing/receding angle of the water pool significantly decreases with increasing rolling speed before the rolling speed reaches a critical value (80 mm/s). At speeds higher than 80 mm/s, the water pool is in a stable state and the advancing/receding angle remains steady. In the case of the microgrooved surface, the influence of the microgroove on water lubricating flow disappears when the rolling speed reaches a critical value (1030 mm/s).
Highlights
The use of water lubrication in engineering can be traced back to about 2400 BC, when people used water as a lubricant in transporting statues in Egypt [1]
Gao et al investigated the tribological behaviors of epoxy composites under water lubrication conditions at both varying and constant sliding speeds [6]
The behavior of a pool of water lubricating under a point of contact between a disk and a steel ball is investigated
Summary
The use of water lubrication in engineering can be traced back to about 2400 BC, when people used water as a lubricant in transporting statues in Egypt [1]. Mamada et al [10] systematically studied the friction properties of polyvinyl alcohol-hydrogel(PVA-H)/steel ball contact under water lubrication conditions. Liu et al [14,15,16,17,18] systematically studied the forming characteristics of lubricating water films. There is an emphasis on the direct the direct observation of the dynamic behaviors of lubricating water films. The results of this study observation of the dynamic behaviors of lubricating water films. The results of this study help to help to improve the understanding of the behavior of lubricating films in water lubrication.
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